GENERAL PRECAUTIONS AND CONSIDERATIONS
RACK MOUNTING
The M•1200/M•1400 amp requires two rack space units (2U = 3.5"). It also requires 16.25" depth inside the rack, including the rear sup- ports. When designing your rack, put the heavier items at the bottom and the lighter items toward the top.
Secure the front panel of the amplifier to the front of the rack using four screws with soft washers to prevent scratching the panel. In ad- dition, because of the weight of the amplifier, you must secure the rear support brackets of the amplifier to the back of the rack. You could use a support rail or shelf across the back of the rack, or angle brackets attached between the rear support brackets and the rear rails of the rack. This is recommended for all compo- nents mounted in a rack that is going to be moved frequently (or thrown in the back of a pickup truck and transported down a bumpy gravel road to that outdoor festival!).
THERMAL CONSIDERATIONS
The M•1200/M•1400 amps are
The M•1200/M•1400’s unique
AC POWER CONSIDERATIONS
Be sure the M•1200/M•1400 is plugged into an outlet that is able to supply 120VAC at high current. If the voltage should drop below 116VAC, the M•1200/M•1400 will no longer be able to supply rated power. (It will continue to operate down to 50% of the rated voltage, but it just won’t be able to reach full rated power.)
Be sure the AC outlet can supply enough current to allow full power operation of all the amplifiers plugged into it. The outlet should be a
WARNING: Bypassing the plug’s ground pin can be dangerous. Please don’t do it.
The AC current demand of an amplifier var- ies depending on several factors, including the crest factor and the duty cycle of the program material. Under typical conditions reproducing rock music where musical peaks are just below clipping, the M•1200/M•1400 will require the following average currents:
| Average | Peak |
| Current | Current |
Amplifier Loading | Required | Required |
2 ohms per side or 4 ohms bridged | 8A | 25A |
4 ohms per side or 8 ohms bridged | 5A | 16A |
8 ohms per side or 16 ohms bridged | 3.2A | 10A |
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It is recommended that a stiff supply of AC power be used because the amplifier places high current demands on the AC line. The more power that is available on the line, the louder the amplifier will play and the more peak output power will be available for cleaner, punchier bass.
Having said this, we also realize that in many applications a standard 15A service may be all that is available. Under typical condi- tions, reproducing rock music where musical peaks are just below the clipping point, you can safely connect more than one amplifier to a 15A service. Use the table below as a guide- line:
| Maximum Number |
| of Amplifiers |
Amplifier Loading | on a 15A Service |
2 ohms per side or 4 ohms bridged | 2 |
4 ohms per side or 8 ohms bridged | 3 |
8 ohms per side or 16 ohms bridged | 5 |
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